WO2019141558A1

WO2019141558A1 - Slope clearing system and method for removing bulk material from a bulk material pile

Info

Publication number: WO2019141558A1
Application number: PCT/EP2019/050406
Authority: WO
Inventors: Guido Scholz; Bernd Slawinski; Ralf Westmattelmann; Guido Schlamann
Original assignee: Thyssenkrupp Industrial Solutions Ag; Thyssenkrupp Ag
Priority date: 2018-01-16
Filing date: 2019-01-09
Publication date: 2019-07-25
Also published as: EP3740446A1; DE102018100820A1; EP3740446B1; DK3740446T3

Abstract

The invention relates to a slope clearing system for removing bulk material from a bulk material pile, which slope clearing system has a movable bridge, wherein at least a first and a second rake are provided, which, for engagement with a cutting surface of the bulk material pile, are arranged next to each other and can be moved along the bridge, and each rake is equipped with a separately controllable rake drive for moving the rakes.

Description

Embankment clearing system and method for destacking bulk material of a

bulk dump

The invention relates to an embankment clearing system and a method for unstacking bulk material of a bulk material pile.

In many industrial processes, such as in the cement industry, the production of products depends crucially on the uniformity of the raw materials used. For this purpose, bulk material dumps are often used, with which a mixing and homogenization of the bulk material is made possible. For unstacking of the bulk material so-called embankment clearing systems are used, which have a displaceable bridge, wherein at least one rake is provided, which comes to remove the bulk material in engagement with a gate surface of the bulk material and long ago the bridge can be moved. Each rake in this case has a large number of activation elements, for example teeth, which penetrate in the region of the gate surface into the bulk material and loosen it, so that it flows down over the gate surface, where it is transported away. Such bank clearing systems are known, for example, from DE 1 983 486 U and SU 1 237 589 A1.

Due to changing customer requirements, mixed beds are increasingly being used today for premix (limestone-clay mixtures). However, caused by the clay content, the handling properties of the bulk material deteriorate considerably. To compensate for this, two measures are usually taken to ensure sufficient performance of the bank clearing system: a. With respect to each activation element (eg every tooth of a rake), a higher activation energy is provided so that a higher digging force per tooth is ensured. b. The number of activation elements (teeth on the rake) is increased to compensate for the decreased stack-out performance per activation element.

However, this has the result that the area of a rake is significantly increased in order to increase the number of activation elements, which in turn requires a very large drive power (= activation power) for each rake. A large

However, raking with a high driving force can cause the following problem with a bulk material having different handling properties in the gate area or having very poor handling properties over the entire area. By compaction, local moisture, etc., there may be locally solidification of the bulk material in the gate area. If one or more activation elements try to "cut through" this area, reaction forces arise that counteract this movement. These locally occurring reaction forces are limited by the total installed drive power. Consequently, it may happen that the rake is loaded locally with the entire driving force, whereby high mechanical stresses in the computing structure and in the trolley, which is responsible for the movement of the rake occur. This leads to fatigue and ultimately to the failure of the structures. A correspondingly adequate dimensioning of the affected structures is not economically justifiable, since they are very large components (up to 550 m ² and more).

As a result of the high forces, weld cracks can occur, which requires a high level of maintenance in the control of the structure and the repair of the cracks. This, in turn, results in high maintenance costs and production downtime, which reduces the performance of the bank clearing system and increases customer dissatisfaction.

The invention therefore has the object of avoiding the above-described problems and in particular to provide an embankment clearing system, which is made robust enough from an economic point of view, too Bulk material with different or very poor handling properties to be able to stagger.

According to the invention, this object is solved by the features of claims 1 and 8. The embankment clearing system according to the invention for unstacking bulk material of a bulk material pile has a displaceable bridge, wherein at least a first and a second rake are provided, which are arranged adjacent to each other for engagement with a gate surface of the bulk material and long since the bridge and each rake with a separately controllable computing drive equipped to process the rake.

In a method for unstacking bulk material of a bulk material pile, at least two rakes arranged next to one another on a displaceable bridge engage a leading edge of the bulk material pile. Each rake is moved in the longitudinal direction of the bridge via a separately controllable computing drive.

Due to the configuration of the invention, the installed drive power can be divided into several rakes, so that the maximum acting reaction force of Schüttguthalde is reduced by the factor of the rake used. In addition, the possible flow of force is shortened by an activation element of a rake on the rake and the trolley accordingly. In this way, the

Stress on the structure of the rake on the one hand by reducing the mechanical stresses (reducing the maximum force acting by the factor of the number of rakes) and increasing the tolerable allowable mechanical stresses (reducing the load cycles to be sustained by shortening the power flow) reduced.

These two effects make the rake and associated trolley much easier to work with, resulting in a more compact structure. This in turn offers the possibility of significantly smaller steel profiles to be able to resort to a similar stiff structure. As a result, the required steel construction weight and the manufacturing cost is reduced.

Further embodiments of the invention are the subject of the dependent claims.

According to a preferred embodiment of the invention, in each case the entire first and the entire second rake can be moved in translation along the bridge; for this purpose, a common travel distance or two separate travel distances can be provided on the bridge.

Furthermore, the two separate computer drives can be provided with a sensor for determining the power consumption. A possibly provided control and regulating device, with the two sensors for the evaluation of the determined

Power consumption is connected, is either with the two computing drives and / or with a bridge drive for moving the bridge in conjunction to adjust the speed of the two rake or the bridge to the determined power consumption of the two computing drives. These measures serve to protect the bank clearing system to reduce the burden on the

Define the embankment system in time.

In addition, it is conceivable that the two rakes are operated at different speeds, so that the distance to each other can be changed. According to a further embodiment of the invention, the two rakes are movable along at least one trajectory, wherein a position detection system is provided for determining the positions of the two rakes to each other and / or for determining the position of the rake on the at least one trajectory. In this way, it is possible to adjust the speed of one rake relative to the speed of the other rake, depending on the distance between the two rakes. In addition, this way a

Collision of the two rakes reliably avoided.

The embankment clearing systems described above can be used both in a longitudinal mixed bed and in a round mixing bed. Both the longitudinal and the circular mixing beds are used for storage and homogenization of raw material components, such as limestone, limestone / clay / clay mixtures, clay or coal. Longitudinal mixing beds have the advantage that they can be extended in comparison to round mixing beds and that the exact chemical composition of the heap can be achieved when building the heaps with the last, selectively stacked material, whereby a higher flexibility in the operation of the upstream quarry can be achieved.

Round blenders, however, represent a more compact and cost-saving solution. The cost savings are mainly due to a cheaper hall, shorter conveyor routes and lower investment in machinery and electrical equipment. While two heaps are provided with longitudinal mixing beds, there are no heap changes in round mixing beds, resulting in no jumps in the chemical composition of the stacked material. It is also possible to feed directly from the round mixing bed without appropriate Mühlenvorbunker the mill. Round blender beds also allow, based on the base area, a higher storage compared to the longitudinal design.

Specific embodiments of these two applications will be explained with reference to the following description and the drawings.

In the drawing show

1 is a plan view of the slope clearing system of a longitudinal mixing bed, FIG. 2 is a sectional view taken along the line B-B of FIG. 1,

3 is a detail view in the range of a computing drive,

4 is a schematic sectional view of a round mixing bed,

Fig. 5 is a sectional view taken along the line AA of Fig. 4 and Fig. 6 is a block diagram of the control and regulating device. FIGS. 1 and 3 show a first exemplary embodiment of an embankment clearing system 2 according to the invention, which is used in a longitudinal blending bed. Longitudinal mixing beds consist of two bulk material dumps, the material being stored in a bulk material pile with the aid of a spreader and being stacked out of the other bulk material pile 1 shown here by means of the bank clearing system 2. Stacking capacities of up to 2500 t / h and more and output capacities of up to 1200 t / h and more can be achieved. The longitudinal mixing bed achieves a high mixing and homogenizing effect.

The slope clearing system 2 has a bridge 3 which can be moved on two parallel rails 4, 5 by means of a bridge drive 28 in both directions.

On the side of the bridge 3 facing the bulk material pile 1, a first rake 6 and a second rake 7 are arranged next to each other for engagement with a gate surface 1a of the bulk material pile 1 and along the bridge 3, d. H. in the direction of the double arrow 10 movable. On the opposite side of the bridge 3, a third rake 8 and a fourth rake 9 are provided, which are then used when the second, not shown here Schüttguthalde to be stacked.

The bulk material pile 1 extends in its width between the two rails 4 and 5. The cross section forms an isosceles triangle, so that also for the gate surface la an inclined by a slope angle a, isosceles

Triangular area results, as can be seen from Figures 1 and 2. The first and second rakes 6, 7 come with one and the same gate surface la for unstacking of the bulk material in engagement. The two rakes 6, 7 are provided on the side facing the gate surface la with activating elements 7a, which are formed for example by teeth, hooks or straps and in the

Bulk material in the region of the gate surface la penetrate, so that the bulk material on the sloping gate surface la flows down, where it is transported by a conveyor 11 and, for example, fed to a mill. Each of the two rakes 6, 7 has a computing trolley 12, which can be moved longitudinally (double arrow 10) of the bridge 3, as can be seen from the detail of FIG. 2. The first rake 6 essentially comes into operative engagement with a part of the gate surface 1a and the second rake 7 with the other part of the gate surface 1a. In the middle area of the gate area 1a, in which most of the material is arranged, the engagement areas of the two rakes overlap 6, 7, which results directly from the two traverse paths a, b according to FIG. The two rakes 6, 7 are also triangular in this case, and have two legs 7b, 7c which are at right angles to one another, wherein the leg 7b is aligned parallel to the bridge 3 and the leg 7c extends approximately to the tip of the gate surface 1a. The first rake 6 has correspondingly formed legs 6b and 6c. The two rakes 6, 7 are facing each other with their two longer legs 6c and 7c.

The area of each rake is less than 40% of the gate area, in particular less than 30%. However, since the two rakes 6, 7 are movable along the bridge 3, the activation elements of the two rakes come into active engagement with the entire gate surface 1a.

The rakes 6 to 9 are fixed by means of cables 13 so that the desired slope angle a results for the gate surface la. The first rake 6 and the second rake 7, which come into active engagement with the gate surface 1a of the bulk material dump, in particular in simultaneous operative engagement, each have a separate computer drive 14, 15. It can be seen from FIG. 3 that the computer drives, in this case the computer drive 15, are each arranged on an associated computing trolley 12. The computing drive 15 is formed for example by an electric motor which drives a pinion 16 which cooperates with a chain 17 laid along the bridge 3. The chain is fixed only at its end points via fasteners 18 and 19 on the bridge 3 and is otherwise loose. In the area of the computing carriage 12, the chain is guided over deflections 20, 21 via the pinion 16. Depending on the direction of rotation of the computing drive 15 then moves the trolley 12 in one or the other direction. Of course, I'm in Under the invention, other drive systems conceivable. Thus, a sprocket provided on the trolley could also intervene directly in a chain rail laid on the bridge.

As a result of the two separate computer drives 14, 15, the first and second rakes 6, 7 can be moved independently of one another, which results in different ones

Speeds and also different directions can be adjusted.

The embankment clearing system shown in FIG. 1 has not only the two rakes 6, 7 but also the third and fourth rakes 8, 9 on the opposite side. These two rakes are then used when the other, not shown bulk material pile to be removed. Thus, either the first and second rakes 6, 7 or the third and fourth rakes 8, 9 are in use. It is therefore advantageous if the first rake 6 and the third rake 8 are mounted on a common computing vehicle 12. In a corresponding manner, the second rake 7 and the fourth rake 9 also form a corresponding one

Pair. Decisive, however, is that the two rakes arranged on one side of the bridge, which come into operative contact with one and the same gate surface 1a, are equipped with separate computing drives 14, 15.

FIGS. 4 and 5 describe a second exemplary embodiment, which shows a round mixing bed. In a round mixing bed, there is no stockpile change, since the bulk material pile 1, is applied in a circle around a central column 22. However, the slope clearing system T of the round mixing bed is constructed relatively similar to the slope clearing system 2 of the longitudinal mixing bed. Therefore, the same reference numerals are used for the same components. The bridge 3 is here connected at one end to a central column 22 and is supported at its outer end on a circular rail 23. Otherwise, a first rake 6 and a second rake 7 are provided in a matching manner, which are passable along the bridge 3 in a manner consistent with the first embodiment. So every rake 12 is on a trolley 12 mounted, which is passable along the bridge 3. In addition, in accordance with the first exemplary embodiment, each of the two rakes 6, 7 is provided with a separate computer drive 14, 15. In this respect, reference may be made in particular to FIG. 3. In addition to the slope clearing system 2 ', FIG. 4 also shows a spreader 24, with which the material is stacked in the bulk material dump 1.

The slope clearance systems 2, 2 'also have a control and regulation concept with which the Ausstapelleistung the slope clearance system 2, 2' can be adapted to the material conditions, so as to form an active machine protection. This control and

Control concept will be explained in more detail below with reference to FIG.

The first computer drive 14 has a first sensor 25 for determining its power consumption. In a corresponding manner, the second computer drive 15 is also in operative contact with a second sensor 26 for determining the power consumption. The measured values of these two sensors 25, 26 are evaluated in a control and regulating device 27, wherein when exceeding a predetermined upper limit of the feed of the bridge 3 via the bridge drive 28 is reduced accordingly. An increased power consumption in one or both of the computing drives 14, 15 may arise, for example, as a result of the fact that an embankment area of the gate area 1a that has just been processed by the rake is solidified. Reducing the feed speed also reduces the stack-out performance until the consolidated slope area has been removed. If the drive power of the relevant computer drive drops again, the bridge feed speed is increased again via the control and regulation device in order to achieve the required stack-out throughput. By adapting the

Pile clearing capacity of the bank clearing system to the material conditions ensures active machine protection.

Furthermore, the computing carriage 12 of the first rake 6, which is associated with the first rake drive 14, be provided with limit switches 29, which with a Motor controller 30 cooperates, so that upon reaching the end position, the direction of movement of the associated computing carriage on the computing drive 14 is reversed. So that the first and second rakes 6, 7 or their computationally responsible components do not collide with each other, at least one distance sensor 31 may be provided, which with a control 32 the

Speed of the second computer drive 15 accordingly adapts.

Claims

Claims:

1. Slope clearing system (2, 2 ') for unstacking bulk material of a bulk material pile (1) with a displaceable bridge, wherein at least a first and a second rake (6, 7) are provided, which for engagement with a gate surface (la) of the bulk pile (1) arranged side by side and along the bridge (3) are movable, characterized in that each rake (6, 7) with a separately controllable computing drive (14, 15) for moving the rake (6, 7) is equipped.

2. Verge clearing system (2, 2 ') according to claim 1, characterized in that in each case the entire first and the entire second rake (6, 7) is translationally along the bridge (3) movable.

3. slope clearing system (2, 2 ') according to claim 1, characterized in that each of the two separate computing drives (14, 15) with a sensor (25, 26) is provided for determining the power consumption.

4. slope clearance system according to claim 3, characterized in that a control and regulating device (27) is provided which is connected to the two sensors (25, 26) for evaluating the determined power consumption of the two computing drives (14, 15).

5. Verge clearing system (2, 2 ') according to claim 3, characterized in that for moving the bridge (3) a bridge drive (28) is provided, which with the control and regulating device (27) for adjusting the speed of the bridge (3 ) in dependence of the determined power consumption of the two computing drives (14, 15) is in communication.

6. slope clearance system (2, 2 ') according to claim 3, characterized in that the two computing drives (14, 15) with the control and

Control device (27) for adjusting the speed of at least one the two computing drives (14, 15) in dependence of the determined

Power consumption of this computing drive (14, 15) is in communication.

7. slope clearing system (2, 2 ') according to claim 3, characterized in that the two rakes (6, 7) along at least one trajectory are movable and to determine the positions of the two rakes (6, 7) to each other and / or for determination the positions of the rake (6, 7) on the at least one trajectory a position detection system is provided.

8. Method for unstacking bulk material of a bulk material pile, wherein at least two compartments (6, 7) arranged side by side on a displaceable bridge (3, 7) engage in stowing of bulk material of the bulk material pile into engagement with a leading surface (1a) of the bulk material pile (1) and into Lengthwise of the bridge (3) are moved, characterized in that each rake (1, 7) via a separately controllable computing drive (14, 15) in the longitudinal direction of the bridge (3) is moved.

9. The method according to claim 8, characterized in that the

Power consumption of the two computing drives (14, 15) is determined and evaluated.

10. The method according to claim 8, characterized in that the bridge (3) is displaceable with a feed rate, which is regulated in dependence of the evaluated power consumption of the two computing drives (14, 15).

11. The method according to claim 8, characterized in that the two rakes (6, 7) on the at least one trajectory of the bridge (3) are moved and the positions of the two rakes (6, 7) to each other and / or the positions of the two Rake (6, 7) determined on the at least one trajectory and used to control the two Rechenantreibe (14, 15).

12. The method according to claim 8, characterized in that the

Speed of at least one rake (6, 7) to the measured

Power consumption of this rake (14, 15) is adjusted.

13. The method according to claim 8, characterized in that the speed of a rake (6) relative to the speed of the other

Rake is adjusted in dependence of the distance between the two rakes (6, 7) to each other.